A proposal/itinerary's Platform is the domain that the itinerary link will appear under.
For more info on Domain Masking, click HERE.
To change the Platform a proposal/itinerary is on, just follow the steps below!
1. Click on the Proposal/Itinerary
Clicking on this will open the Trip Sidebar on the right-hand side of your screen.
2. Click on the Title of the Proposal or Itinerary
Clicking on the Title will open the Menu, which allows you to change the Platform.
3. Change the Platform
From there, just click on the platform to the right-hand side to change the itinerary's platform.
Once you're finished, just click Done in the top right corner!